Studies and weighbridge audits consistently show that a significant proportion of caravans on Australian roads are travelling above their legal weight limits. Not by a few kilos — by hundreds. Most owners have no idea until a random roadside inspection, a weighbridge check, or a tyre failure makes the problem impossible to ignore.
The gap between what caravan manufacturers advertise as payload and what owners actually have available after factory options and dealer accessories is the root cause. A van advertised with 800 kg of payload might ship with a tare weight 200–300 kg heavier than the brochure figure, leaving 500–600 kg for water, gas, and everything you want to carry. It is not hard to exceed that.
How to Check Right Now
The definitive answer requires a weighbridge. Search for your nearest public weighbridge — most are operated by state road authorities and cost between $15 and $30 for a weigh. Some are free.
Load your van exactly as you would for a trip. Full water tanks, gas bottles connected, fridge stocked, clothes packed, tools stowed, bikes on the rack. Drive onto the weighbridge and weigh the caravan on its own axles (unhitched from the tow vehicle). This gives you the loaded axle weight. Then weigh the complete combination. The difference between the combined weight and the caravan-only weight gives you the ball weight.
Compare your measured weights against the ratings on your compliance plate:
Loaded caravan weight vs ATM: If your loaded caravan weighs more than its ATM, it is overweight and unroadworthy. Full stop.
Combined weight vs GCM: If the total combination exceeds your tow vehicle’s GCM, the combination is overweight — even if each unit is individually within its limits.
Ball weight vs tow vehicle rear axle: Check that adding the ball weight to the tow vehicle does not push it over its rear axle rating or its GVM. This is where many combinations fail, especially vehicles with heavy accessories like steel bull bars, long-range fuel tanks, and drawer systems.
Warning Signs You Might Be Over
Weighbridge data is the only certainty, but these symptoms often indicate an overweight rig:
Rear suspension sitting noticeably low when hitched, especially with aftermarket accessories and a full water tank. If the tow vehicle’s headlights point upward when loaded, the rear is sagging and weight distribution is wrong.
Braking distances feel longer than expected, or the trailer pushes the vehicle under heavy braking. Overloaded brakes take significantly longer to stop the combination, and brake fade on descents becomes more pronounced.
Tyre wear patterns are uneven. Excess weight on an axle causes accelerated shoulder wear. If your caravan tyres wear faster on one side or show heavy shoulder wear on both sides, the tyres are carrying more weight than their inflation supports.
The van sways at highway speed. While sway has multiple causes, an overloaded rear axle and insufficient ball weight are among the most common. If your van feels unstable at 100 km/h, weight distribution should be the first thing you investigate.
Practical Strategies to Reduce Weight
Audit everything. Pull every item out of the van and weigh it on a bathroom scale. Group items by category: kitchen, tools, clothing, spare parts, outdoor furniture, bedding. People are consistently shocked at how much their “essentials” weigh. A full toolkit, a generator, camp chairs for four, and a Weber barbecue can easily add 80–120 kg that you might not miss.
Travel with less water. Water weighs 1 kg per litre, and a 200-litre tank adds 200 kg. If you are travelling between caravan parks every day or two, you rarely need full tanks. Fill to 25–50% for transit and top up on arrival. This single change can free up 100–150 kg of payload.
Replace heavy items with lighter alternatives. Steel gas bottles weigh 16–18 kg empty; composite bottles weigh 5–7 kg. Steel recovery gear adds up quickly — consider whether you need everything you carry on every trip. Hardcover books, heavy cast-iron cookware, and full-size power tools are common weight offenders.
Move weight to the tow vehicle. Items that are going to travel anyway — personal bags, camera gear, food that does not need refrigeration — can ride in the tow vehicle instead of the van, reducing the van’s axle load. Check that moving weight forward does not push the tow vehicle over its own GVM.
When Reducing Weight Is Not Enough
If your van is still over its ATM after a serious weight audit, the next option is a GVM upgrade (for the tow vehicle) or an ATM upgrade (for the caravan). These are engineering modifications performed by accredited companies that upgrade suspension, brakes, and axles to handle higher rated weights. A GVM upgrade typically costs $3,000–$6,000 for the tow vehicle. An ATM upgrade for a caravan varies depending on the work required.
A GVM or ATM upgrade is a permanent modification that comes with a new compliance plate showing the increased rating. It does not change the tyres, though — upgraded ratings often require upgraded tyres to match. Check the tyre load ratings after any weight upgrade.
Check Your Rig Before You Drive
Ready2Tow lets you model your complete weight picture before you get to the weighbridge. Enter your tow vehicle and caravan specs, add your payload across four zones, and the app checks every weight rating instantly. Green means safe. Red means stop and fix it. The Free tier gives you a pass/fail verdict at no cost. Tow Pro adds per-wheel tyre pressures matched to your actual load.
